It was _Monitor VII_, manned by the Chicagoans, which had the honor of sighting the enemy. Just as the twilight of a bright May day was closing down over the radio men at the Philadelphia airport, the static detector marked an unusual disturbance, then two quick shocks, which must have come from the patrol's bow beam. In quick succession, the other five, standing ready on their starting ramps, took in their crews, and roared up and away in a torrent of explosions at a thousand miles an hour. Soaring to fifty thousand feet above the earth, the squadron of rocket-ships made its way north, _Monitor II_ in the lead. "Well, here we go," called Gloria, gaily, from her seat behind the searchlight. "Hope they don't give us the run-around this time." "They won't have the chance," said Ben. "That is, provided those Chicago boys have sense enough to remember their instructions and let them alone till we all get there. With six of these ships we ought to be able to rough 'em up a little bit." At a speed of over a thousand miles an hour, thanks to the thinness of the atmosphere through which they were traveling, it was only a few minutes' hop from Philadelphia to the Catskill city of the elephant-men. Ben had hardly finished speaking before Sherman called from the control seat, "There they are!" Far beneath, half revealed, half-hidden by the few tiny clouds of fleece that hung at the lower altitudes, they could see the naked scar in the hills that marked the Lassan headquarters. Around it floated half a dozen of the huge green balls they had encountered on the last occasion. As they swept by, another one, looking like a grape at the immense distance, trundled slowly out from the enormous door, swung to and fro for a second or two and then swam up to join those already in the sky. _Monitor VII_ was to the north and above them--as she perceived the American fleet she swept down to join the formation, falling into her prearranged place. "Do we go now?" asked Sherman. "Not yet," said Ben. "Give them all a chance to get out. The more the merrier. I'd like to finish the job this time. We can't get in that door, and if we did the rocket-ships would be no use to us in those passages, and they're the best we've got. Besides they're playing snooty too, and aren't paying a bit of attention to us. I hope they intend to fight it out to a finish this time." They turned north, giving the Lassans time to assemble their fleet. "What's the arrangement?" asked Gloria. "Do we all go for them at once?" "No. We dive in first and the rest follow behind, pulling up before they get in range. If anything happens to us, they'll rescue us--if they can. You see we don't know what they've got any more than they know what we've got, and I thought it would be a good idea to try the first attack with only one ship. In a pinch the rest can get away--if the Lassans haven't developed a lot of speed on those green eggs of theirs."